all: smoother rating clearing (fixes #7727)

[RyanS4]

Fixes #7727

Description

• Adds a clear ('X') button next to active stars in the rating dialog to allow learners to reset/clear ratings.
• Deletes the rating document from CouchDB upon submitting a 0-star rating and recalculates aggregate rating statistics.
• Adds unit tests covering rating clearing and CouchDB document deletion.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between da71ac2 and 53f1d00.

📒 Files selected for processing (4)

• src/app/shared/dialogs/dialogs-form.component.html
• src/app/shared/dialogs/dialogs-form.component.ts
• src/app/shared/forms/planet-rating.component.spec.ts
• src/app/shared/forms/planet-rating.component.ts

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